Libreoffice Writer Won't Save As or Open Past Documents

I’m using Writer to write new documents. When I try to “Save” or “Save As”, I get the “File Not Found. Check the file name and try again.” message. This is when I’m trying to save a document that has not been saved before. I also can’t open any of my past documents. When I try, they’e either “Not Found” or “The lock file could not be created for exclusive access by LibreOffice, due to missing permission to create a lock file on that file location or lack of free disk space.” I have tons of free disk space on my computer. I’ve also tried reinstalling Libreoffice. Help? Screenshot 2021-04-29 095503.png

Liekly a problem with your antivirus, see: Defender Controlled folder access exception for LibreOffice.

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